Pic 16f876a Pure Sinewave inverter

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codewiz

Joined: 14 Sep 2008
Posts: 75

25 Jun 2009 18:43 full-bridge inverter pdf

Hi Taner. Sorry to disturb you. please, can you give the normal voltages expected for the different input signals for the mcu. I mean, on normal working condition, what voltage or range of voltage should curr_l , curr_h , V_OUT , volt etc. measure. Thanks in advance because i want to modify design to handle more load.

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

25 Jun 2009 20:29 pic based sine wave inverter

Hi codewiz,
V_OUT = 2.5V +/- max 1.5V (min 1V, max 4V, middle point 2.5V, sine wave)
curr_h = 2.5V +/- max 1V (min 1.5V, max 3.5V, middle point 2.5V, sine wave)
curr_l = 2.5 V +/- max 0.25V (middle point 2.5V, sine wave)
volt = 4.45 - 4.82 Vdc
Stdby = 0 - 5 Vdc
b/a - depending on MOSFET Rds and output current magnitude, approx. 1 - 2V max.

Best regards.
Taner

sekki

Joined: 23 Jun 2009
Posts: 3

25 Jun 2009 23:56 secondary-side pwm sine inverter schematics

Hello OBIALOR

Attach a sorce code

pic---SQUARE wave(isolate)---lpf---lpf---sine ref---comp---full brige--------out
\---feed back------\

use pic basic compiler

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OBIALOR

Joined: 12 Nov 2005
Posts: 51

26 Jun 2009 16:36 pic sine wave inverter code source

THANK YOU SEKKI,IN YOUR SCHEMATIC YOU USE PIC16F876, WHY F84-50HZ-60HZ? YOU MENTION ON THE PDF FILE.

sekki

Joined: 23 Jun 2009
Posts: 3

27 Jun 2009 1:53 pic sine wave inverter circuits

Hello OBIALOR

The file name does not matter.
Finally, the PIC16F873 For each monitoring.

Sorry able to English

OBIALOR

Joined: 12 Nov 2005
Posts: 51

28 Jun 2009 13:11 pwm inverter c code

OK, DID YOU HAVE THE PCB?
ALSO I HAVE COMPILE THE SOURCE CODE AND IS OK, PLEASE GIVE ME MORE DETAILS ON THE COMPONENTS.

codewiz

Joined: 14 Sep 2008
Posts: 75

29 Jun 2009 17:50 es.co.th

Thanks Taner for the signal voltages. it means that thevoltages are divided by the resolution of ADC (0.0196) for 8bit mode to give the digital value for coding. for instance, input signal of 1.5v will give approx. 77 as digital value. am i right? please correct me if i'm wrong. i was wondering what V_BAT is at 10.8v and 16v because in your code you divided the digital value by 32 ie [acc_v_avg = acc_v_temp>>5]. it seems not to give me value comparable to "acc_min_l" and "acc_max_h". clear my doubt. i may be getting something wrong. thanks for your support.

khossanr

Joined: 22 Jun 2009
Posts: 4
Location: BANGLADESH

30 Jun 2009 18:51 pic inverter circuit

Dear all, I m new here. I want to make a microcontroller programming board using serial/USB port,with software,schematic,PCB, if anybody please help me...

Thanks with advance.

howidam

Joined: 23 Apr 2009
Posts: 16

02 Jul 2009 11:59 sine wave inverter reference design avr

Dear friends ,
i don't understand how to create the LUT of sin wave or level correction that used to configure pic register to control PWM. could you help please
how could i get 81,162,.....

Thanks,
wait your reply

santhosh5673

Joined: 28 Apr 2009
Posts: 3

05 Jul 2009 10:50 pure sine wave inverter pcb

Hi Taner/Codewiz

Sinewave Lookup Table calculation:
Ki = PWMmax*sin(i*180/n),
where:
PWMmax=1023
i = 0,1,2,...,n
Best regards.
Taner

I can't be able to get
sine_wave[32] = {81,162,241,318,392,462,527,588,642,691,733,768,795, 815,827,831,827,815,795,768,733,691,642,588,527,462,
392,318,241,162,81,0}

For examle if i = 32 starting from say 1 to 32

when i = 1 ; Ki = 1023 * sin(180/32) = 100
when i = 2 ; Ki = 1023 * sin(360/32) = 200
when i = 3 ; Ki = 1023 * sin(3*(180/32)) = 296
when i= 4 ; Ki = 1023 * sin(4*(180/32)) = 391
when i = 5 ; Ki = 1023 * sin(5*(180/32)) = 482 and so on.

I had calculated using a calculator, if this is not the way to calculate, can you please suggest me how to get those values.

Also how to get the volt_ref_sin[32] = {.........} values.

Please suggest, I am doing a project work on PIC based Inverter.

Thanking you
santosh

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

05 Jul 2009 22:06 pic pwm sine

Hi santosh,

Sinewave Lookup Table calculation:
Ki = PWMmax*sin(i*180/n),
where:
PWMmax = 0 -:- 1023
i = 0,1,2,...,n

PWMmax = 831 in this Inverter design.

Best regards.
Taner

howidam

Joined: 23 Apr 2009
Posts: 16

06 Jul 2009 7:01 chinese inverter for ups in karachi

Dear friends,
why you deciede to use 831 as PWMmax , how to calculate it ? what is the design parameter used to get this value (is it function in Vin,Vout......)

santhosh5673

Joined: 28 Apr 2009
Posts: 3

06 Jul 2009 18:51 programma in c per inverter pwm sine wave

Hi Taner/Howidam

Taner thank you for the support
Hi howidam, I too thought of asking the same question of how PWMmax = 831 has been got.

---> Taner
1] If PWMmax = 831, then do we need to change the value in the declaration
const long pwm_max=1023; to
const long pwm_max=831; ????

2] I was unable to come up to get the values of
volt_sine_ref[32] and delta_corr[32], Please guide me in this regard with equations for the same.

3] Also, I tried to search some documents related to "programming pic16* in C" but could't got. Is that can be got only by installing ccs c compiler or can I have some documents (pdf) for learning all the c programming syntax (instructions) like read_adc(), output_high(), set_adc_channel() etc ??. If you have please share the programming pdf, docs.

4] I was unable to understand some keywords like ADC_READ_ONLY, ALL_ANALOG, ADC_CLOCK_DIV_32, etc. Where does these words have been declared ??

Please provide me the solution.

santhosh

Last edited by santhosh5673 on 07 Jul 2009 13:15; edited 1 time in total

santhosh5673

Joined: 28 Apr 2009
Posts: 3

07 Jul 2009 10:03 inverter pwm sine wave

Hi prends/Taner Neutral

I just downloaded ccs c 30 days demo version, where I just ruuned the pwm_inverter.c program. It has given .h file where all the #defines have been listed.
But still for the other first 3 q's I coul't got the solution. If anybody have "programming pic16f* using c" documentations please share.

When i compiled the .c file I got a error: program is too large - sine_pwm

I guess program memory is not sufficient here. Is there any solution for this, please suggest.

santhosh

MRahman

Joined: 14 Jul 2007
Posts: 2

07 Jul 2009 19:38 pic pwm converter

Hi Mr. Santhosh

Please use CCS C -V4 you should be able to compile it. http://rapidshare.com/files/176344522/CCS_4.084.RAR -for compiler.
Thank you
Mohamad

codewiz

Joined: 14 Sep 2008
Posts: 75

08 Jul 2009 8:24 16f876a ccs

codewiz wrote:

I still have doubt about the above. I may not really get the reason why ">>" is often used in C for ADC. Please Taner I'm still waiting for help. Thanks.

howidam

Joined: 23 Apr 2009
Posts: 16

09 Jul 2009 11:46 pic16f876a based dc-ac inverter circuits

dear friends,
why we set PWMmax as 831 and how we can map the given sine wave LUT to a real time values like 20us,... duty cycle of the sine.
and please , if any one can guide me in concept and how to construct the LUT.
thanks
best regards,

asif hameed

Joined: 29 Nov 2003
Posts: 6

05 Sep 2009 8:03 16f876a

Hi Mr. Taner,

thank you for your great design but i am facing the following problem.
After Assembeling inverter and burning the pic, i tried to fire it up. but only red and green led's are blinking alternatively at a 1 sec. interval. I had checked every track and connection and its all ok. On checking on Osciloscope the A/B and OE signals from pic are not generating, but the pwm signal is there. What would be the problem? plz help.

i will be highly obliged.

Taner

Joined: 17 May 2006
Posts: 96
Helped: 5
Location: Bulgaria, Plovdiv city

06 Sep 2009 11:39 pwm inverters schematic

Hi asif hameed,
Active level of OE signal is low level (Log. "0").
A/B direction signal is a square wave signal with frequency 50Hz and 50% duty cycle.
For correct work of the inverter all feedback signals must be connected to the PIC MCU, with normal working levels.

Best regards.
Taner

asif hameed

Joined: 29 Nov 2003
Posts: 6

07 Sep 2009 18:53 circuit pwm for inverter

Thank you for your quick reply.

I have simulated the invereter in proteus and after some struggling, achieved the simulated output. I found that my system is lacking the feedback from FET's i,e. a/b which must be from 1-2 volts as you mentioned earlier. i am using FET's P75NF75 instead of IRL3803, do you think that it can cause the problem? I am working on it and hopefully will update you tomorow. I am uploading the photo of my version of inverter Smile

.[/img]

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asif hameed

Joined: 29 Nov 2003
Posts: 6

09 Sep 2009 16:48 sine wave ccs pic conversor

Sorry for the delay, update of last day and today: as there was no feed back from a/b signal so i provided 1.5 volts on pin # 1 & 2 of u10 and inverter started to oscilate but only for the breif period as it was going to standby mode. During this time i measured the output which was 150 volts approx and on scope this wasn't a sine wave but nearly a sqaure wave. After attaching a 100 watts load of a light bulb, still the results were same while Q1 and Q3 were heating like a steam engine Sad

. I am using P75NF75 instead of IRL3803 and since there is some difference between the two RDs,(quite nominal yet), do you think that it may cause the trouble? waiting for your reply. Smile

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MRahman

Joined: 14 Jul 2007
Posts: 2

12 Sep 2009 0:07 programação pic 16f876a

Dear all readers
Regarding Mr.Taner’s Sine wave Inverter following voltage has to be same then Inverter should run smoothly.
PIC SIDE:
Pin 5 = 1.8v, Pin 7 = 2.5v, Pin 15 = 4v. and
4053 SIDE:
Pin 12 = 3.5v, Pin 13 = 3.5v, Pin 1 = 1v, Pin 2 = 1v, Pin 5 = 4.5v, Pin 3 = 0.5v.

Thanking you all
Regards
M Rahman

fdoehpp

Joined: 12 Sep 2009
Posts: 1

17 Sep 2009 4:11 inverter using pic

hi,
could anyone suggest me which software can simulate the circuit...
may i use tlp421 instead of tlp250?
thanks.

asif hameed

Joined: 29 Nov 2003
Posts: 6

18 Sep 2009 5:14 b82725j

Hi fdoehpp,
You cannot use Tlp421 instead of TLP250. To simulate the circuite try proteus 7.

Best Regards.
Asif

doc007

Joined: 09 Oct 2009
Posts: 2

11 Oct 2009 11:25 Re: Pic 16f876a Pure Sinewave inverter

Good morning Taner
I am in France and very interested by your inverter for the solar energie.
My question will be simple: can'I adapt your circuit to have more powwer (1000 or 1500 W). Is it enough to change the transfo with more power transistors ??
Can the assemblage concerning the sinusoide be the same?
Thank you for the answer
Pierre

nebile

Joined: 12 Nov 2008
Posts: 1

12 Oct 2009 10:34 Re: Pic 16f876a Pure Sinewave inverter

doc007 wrote:

Taner,

I bought an inverter from the internet ( 3500 Watt - 220 V). Unfortunately there was a short circuit in my holiday flat and the inverter blew up. I opened the inverter and discovered 2 parts in it. 1 part being the controller responsible for pwm signal creation and the second part is the power board (24 FETs) and small transformers ( 6 transformers).

I was wondering the same thing, whether we can increase the output of the inverter by scaling the power output.

sahu

Joined: 09 Oct 2009
Posts: 43
Helped: 3
Location: india

12 Oct 2009 16:15 Re: Pic 16f876a Pure Sinewave inverter

hi friends
i am new micro contrller tech.
pl any body help me about sqer. wave inverter baesd 16f72 or 16f676. its fecher cvcc . low batt cutoff. over ch cut off, over lode proection. short ckt.proection and so on. as req.

voltajalal

Joined: 30 Nov 2008
Posts: 3

04 Nov 2009 14:10 Re: pwm inverter circuits

Sir,
Can you attach a built in 6A. Charger for this inverter

rashmi30

Joined: 08 Nov 2009
Posts: 3
Location: india

08 Nov 2009 9:03 Re: Pic 16f876a Pure Sinewave inverter

Sir,
please some one attach a built in 6A. Charger for this inverter

loganraju

Joined: 27 Aug 2009
Posts: 2
Location: coimbatore

12 Nov 2009 19:49 Re: Pic 16f876a Pure Sinewave inverter

hi taner,
i am very new to this project. i have designed a pcb and assembled it. but it is not at all working. could you please give the steps to be followed so that i can check the functioning of the circuit from the beginning. what i mean to say is, as soon as power is given what should i expect from the circuit. what should i check either using multimeter or using CRO. i need steps to be followed in configuring the circuit.

thanks
logan